Halim and Abdel Wahab did have a few disagreements on the song MEN GHEIR LEH and Halim did ask Ustaz Abdel Wahab to modify a few sections of this song to make it suit his voice better. However, it is NOT TRUE that he ever said that he won't sing it!! He was very proud of this new song and was looking forward to singing it in July 1977 (A3yad El Thowra). You can hear it clearly on the CD that is available for sale on this song, that Halim kept on asking Abdel Wahab to fix some of the transitional parts between the "maqamat" to better accomedate his voice and you can hear how Abdel Wahab kept on resisting any changes!
Abdel Halim And Abdel Wahab had many differences over their 20+ years of friendship. There was another "khelaf" when Abdel Wahab composed INTA OUMRY for Um Kulthoum but did not fulfill their agreement to have the song published through Sout El Phan. Still Halim always LOVED his Ustaz and admired him immensly.